Froebel, F. (1893). The education of man. D. Appleton.
Cita Chicago (17th ed.)Froebel, Friedrich. The Education of Man. D. Appleton, 1893.
Cita MLA (9th ed.)Froebel, Friedrich. The Education of Man. D. Appleton, 1893.
Atenció: Aquestes cites poden no estar 100% correctes.